NEW YORK (AP) — When Daniel Penny wrapped his arm around the neck of a homeless man on a Manhattan subway last year, the 25-year-old veteran appeared to be deploying a non-lethal chokehold long drilled into U.S. Marines.
Done right, the maneuver should knock a person out without killing them, according to Joseph Caballer, a combat instructor in the Marine Corps who trained Penny in several types of holds. But held too long, the technique can restrict the flow of blood to a person's brain, ending their life in a matter of minutes.